With the month of June of the previous year finally copied and corrected, Hana quickly looked in the cabinet to see which folders were present in duplicate for the period in question. Some documents were indeed present several times, and by going back and forth between her desk, the cupboard, and the sorting room, she amassed a good thickness of documents to destroy.
Yuuto even had to help her with the transport by bringing some cardboard storage boxes, filled to bursting with sheets of paper folded and twisted in all directions. Probably documents that hadn't been touched since they were put in those boxes, and that had effectively taken up space for nothing in the filing cabinets.
All of this represented a fairly large volume to deal with, and since this was the first time she had to deal with this kind of task, Yuuto had agreed to quickly explain to her how to proceed.